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SubjectRe: [RFC] Virtual Machine Device Queues(VMDq) support on KVM
On Mon, Sep 21, 2009 at 09:27:18AM -0700, Chris Wright wrote:
> * Stephen Hemminger (shemminger@vyatta.com) wrote:
> > On Mon, 21 Sep 2009 16:37:22 +0930
> > Rusty Russell <rusty@rustcorp.com.au> wrote:
> >
> > > > > Actually this framework can apply to traditional network adapters which have
> > > > > just one tx/rx queue pair. And applications using the same user/kernel interface
> > > > > can utilize this framework to send/receive network traffic directly thru a tx/rx
> > > > > queue pair in a network adapter.
> > > > >
> >
> > More importantly, when virtualizations is used with multi-queue
> > NIC's the virtio-net NIC is a single CPU bottleneck. The virtio-net
> > NIC should preserve the parallelism (lock free) using multiple
> > receive/transmit queues. The number of queues should equal the
> > number of CPUs.
>
> Yup, multiqueue virtio is on todo list ;-)
>
> thanks,
> -chris

Note we'll need multiqueue tap for that to help.

--
MST


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